MATLAB Central Newsreader - reading data from a tex file

reading data from a tex file

Dimitar Dimitrov — Tue, 31 Jul 2007 15:49:21 -0400

Hello,

I have a text file with the following format:

% J1 J2
1 2
3 4
5 6
7 8
% J1 J2 J3
1 2 3
4 5 6
7 8 9
...

After each % mark, the data has different dimensions.
I want to read this file, and save it in "n" different matrices (for the example above n=2)

Mat(1).H = [1 2 ; 3 4 ; 5 6 ; 7 8]
Mat(2).H = [1 2 3 ; 4 5 6 ; 7 8 9]
...

Is there a simple way to do that.
Thank you!

reading data from a tex file

us — Tue, 31 Jul 2007 16:05:06 -0400

Dimitar Dimitrov:
<SNIP yet another data import evergreen...

one of the solutions is outlined below

% contents of file <foo.txt>
% J1 J2
1 2
3 4
5 6
7 8
% J1 J2 J3
1 2 3
4 5 6
7 8 9

% the engine
     fnam=foo.txt';
     a=textread(fnam,'%s','delimiter','','whitespace','');
     an=cell(numel(a),1);
for i=1:numel(a)
     [an{i,1:3}]=sscanf(a{i},'%f');
end
     ixs=[0,cellfun(@isempty,an(:,3)).',0];
     ib=strfind(ixs,[0,1]);
     ie=strfind(ixs,[1,0])-1;
if ~isempty(ib)
     nb=numel(ib);
     rb=cell(nb,1);
for i=1:nb
     nc=an{ib(i),2};
     rb{i,1}=reshape(cat(1,an{ib(i):ie(i),1}).',nc,[]).';
end
end
% the result
     type(fnam);
     rb{:}

us

reading data from a tex file

Dimitar Dimitrov — Tue, 31 Jul 2007 18:02:58 -0400

"us " <us@neurol.unizh.ch> wrote in message <f8nmji$rcb$1@fred.mathworks.com>...
> Dimitar Dimitrov:
> <SNIP yet another data import evergreen...
>
> one of the solutions is outlined below
>
> % contents of file <foo.txt>
> % J1 J2
> 1 2
> 3 4
> 5 6
> 7 8
> % J1 J2 J3
> 1 2 3
> 4 5 6
> 7 8 9
>
> % the engine
> fnam=foo.txt';
> a=textread(fnam,'%s','delimiter','','whitespace','');
> an=cell(numel(a),1);
> for i=1:numel(a)
> [an{i,1:3}]=sscanf(a{i},'%f');
> end
> ixs=[0,cellfun(@isempty,an(:,3)).',0];
> ib=strfind(ixs,[0,1]);
> ie=strfind(ixs,[1,0])-1;
> if ~isempty(ib)
> nb=numel(ib);
> rb=cell(nb,1);
> for i=1:nb
> nc=an{ib(i),2};
> rb{i,1}=reshape(cat(1,an{ib(i):ie(i),1}).',nc,[]).';
> end
> end
> % the result
> type(fnam);
> rb{:}
>
> us

"us",
Thank you for the prompt reply!
This solves the problem.

Dimitar